Potatoes and potatoes are the same thing, which should be corrected first, but fitness depends on how potatoes are eaten. Whether potatoes can lose weight or exercise depends mainly on their methods. If you fry potato chips with them, I can say for sure that there is absolutely no chance to lose weight. The real way to lose weight is to cook or steam them without any oil. Potatoes can provide you with energy and you won't be so hungry. If you exercise, you should eat them at dinner.